DDT is a pesticide banned in Australia for its danger to humans and animals. In an experiment on the impact of DDT, six rats were exposed to DDT poisoning and six rats were not. For each rat in the experiment, a measurement of nerve sensitivity was recorded. The researchers suspected that the mean nerve sensitivity for rats exposed to DDT is greater than that for rats not poisoned. The following data was obtained:

Let 1 be the mean nerve sensitivity for rats poisoned with DDT. Let 2 be the mean nerve sensitivity for rats not poisoned with DDT.